My Family's Inheritance is Debts from Across the Heavens

Bad news strikes, and I become an orphan?With the help of the neighbors, after taking care of everything, I opened the inheritance box left by my parents...Zhang Wuji owes a copy of the Qiankun Great Shift...Shi Zhixuan owes a copy of the Undying Seal...The Undying Emperor owes a copy of the Undying Scripture...Willow God owes a copy of the Original True Solution...Tongtian Cult Master owes a set of the Four Immortal Execution Swords...Son, father left you a system...Son, mother has put the IOUs in the box...Gu Yang: "..."Are you playing with me like this?So, who have I been mourning for these past few days?